PathCacheContext.php

<?php

namespace Drupal\Core\Cache\Context;

use Drupal\Core\Cache\CacheableMetadata;

/**
 * Defines the PathCacheContext service, for "per URL path" caching.
 *
 * Cache context ID: 'url.path'.
 *
 * (This allows for caching relative URLs.)
 *
 * @see \Symfony\Component\HttpFoundation\Request::getBasePath()
 * @see \Symfony\Component\HttpFoundation\Request::getPathInfo()
 */
class PathCacheContext extends RequestStackCacheContextBase implements CacheContextInterface {
    
    /**
     * {@inheritdoc}
     */
    public static function getLabel() {
        return t('Path');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getContext() {
        $request = $this->requestStack
            ->getCurrentRequest();
        return $request->getBasePath() . $request->getPathInfo();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCacheableMetadata() {
        return new CacheableMetadata();
    }

}